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Particle–water interactions of completely soluble or insoluble particles arefairly well understood but less is known of aerosols consisting of mixturesof soluble and insoluble components. In this study, laboratory measurementswere performed to investigate cloud condensation nuclei (CCN) activity ofsilica particles mixed with ammonium sulfate (a salt), sucrose (a sugar)and bovine serum albumin known as BSA (a protein). The agglomeratedstructure of the silica particles was investigated using measurements with adifferential mobility analyser (DMA) and an aerosol particle mass analyser(APM). Based on these data, the particles were assumed to be compactagglomerates when studying their CCN activation capabilities. Furthermore,the critical supersaturations of particles consisting of pure and mixedsoluble and insoluble compounds were explored using existing theoreticalframeworks. These results showed that the CCN activation of single-componentparticles was in good agreement with Köhler- and adsorption theory basedmodels when the agglomerated structure was accounted for. For mixedparticles the CCN activation was governed by the soluble components, and thesoluble fraction varied considerably with particle size for ourwet-generated aerosols. Our results confirm the hypothesis that knowing thesoluble fraction is the key parameter needed for describing the CCNactivation of mixed aerosols, and highlight the importance of controlledcoating techniques for acquiring a detailed understanding of the CCNactivation of atmospheric insoluble particles mixed with soluble pollutants

CCN activation of fumed silica aerosols mixed with soluble pollutants